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Make redaction check easier to read (#2995)

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We need to check the redaction PL in Dendrite, if we do it in GMSL, we
end up not sending the event to the output stream because it will be
rejected.

---------

Co-authored-by: kegsay <kegan@matrix.org>
This commit is contained in:
Till 2023-03-03 14:03:17 +01:00 • committed by GitHub
parent 7cde99a7a7
commit 9bcd0a2105
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GPG key ID: 4AEE18F83AFDEB23
6 changed files with 285 additions and 28 deletions
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5
roomserver/storage/interface.go
View file

@ -19,6 +19,7 @@ import (
"github.com/matrix-org/gomatrixserverlib"
"github.com/matrix-org/dendrite/roomserver/state"
"github.com/matrix-org/dendrite/roomserver/storage/shared"
"github.com/matrix-org/dendrite/roomserver/storage/tables"
"github.com/matrix-org/dendrite/roomserver/types"
@ -184,7 +185,7 @@ type Database interface {
GetOrCreateEventTypeNID(ctx context.Context, eventType string) (eventTypeNID types.EventTypeNID, err error)
GetOrCreateEventStateKeyNID(ctx context.Context, eventStateKey *string) (types.EventStateKeyNID, error)
MaybeRedactEvent(
ctx context.Context, roomInfo *types.RoomInfo, eventNID types.EventNID, event *gomatrixserverlib.Event, redactAllowed bool,
ctx context.Context, roomInfo *types.RoomInfo, eventNID types.EventNID, event *gomatrixserverlib.Event, plResolver state.PowerLevelResolver,
) (*gomatrixserverlib.Event, *gomatrixserverlib.Event, error)
}
@ -226,7 +227,7 @@ type EventDatabase interface {
// MaybeRedactEvent returns the redaction event and the redacted event if this call resulted in a redaction, else an error
// (nil if there was nothing to do)
MaybeRedactEvent(
ctx context.Context, roomInfo *types.RoomInfo, eventNID types.EventNID, event *gomatrixserverlib.Event, redactAllowed bool,
ctx context.Context, roomInfo *types.RoomInfo, eventNID types.EventNID, event *gomatrixserverlib.Event, plResolver state.PowerLevelResolver,
) (*gomatrixserverlib.Event, *gomatrixserverlib.Event, error)
StoreEvent(ctx context.Context, event *gomatrixserverlib.Event, roomInfo *types.RoomInfo, eventTypeNID types.EventTypeNID, eventStateKeyNID types.EventStateKeyNID, authEventNIDs []types.EventNID, isRejected bool) (types.EventNID, types.StateAtEvent, error)
}

28
roomserver/storage/shared/storage.go
View file

@ -13,6 +13,7 @@ import (
"github.com/matrix-org/dendrite/internal/caching"
"github.com/matrix-org/dendrite/internal/sqlutil"
"github.com/matrix-org/dendrite/roomserver/state"
"github.com/matrix-org/dendrite/roomserver/storage/tables"
"github.com/matrix-org/dendrite/roomserver/types"
)
@ -660,6 +661,12 @@ func (d *Database) GetOrCreateRoomInfo(ctx context.Context, event *gomatrixserve
if roomVersion, err = extractRoomVersionFromCreateEvent(event); err != nil {
return nil, fmt.Errorf("extractRoomVersionFromCreateEvent: %w", err)
}
if roomVersion == "" {
rv, ok := d.Cache.GetRoomVersion(event.RoomID())
if ok {
roomVersion = rv
}
}
var roomNID types.RoomNID
err = d.Writer.Do(d.DB, nil, func(txn *sql.Tx) error {
roomNID, err = d.assignRoomNID(ctx, txn, event.RoomID(), roomVersion)
@ -668,6 +675,9 @@ func (d *Database) GetOrCreateRoomInfo(ctx context.Context, event *gomatrixserve
}
return nil
})
if roomVersion != "" {
d.Cache.StoreRoomVersion(event.RoomID(), roomVersion)
}
return &types.RoomInfo{
RoomVersion: roomVersion,
RoomNID: roomNID,
@ -838,6 +848,7 @@ func (d *Database) assignRoomNID(
return 0, err
}
d.Cache.StoreRoomServerRoomID(roomNID, roomID)
d.Cache.StoreRoomVersion(roomID, roomVersion)
return roomNID, nil
}
@ -926,7 +937,7 @@ func extractRoomVersionFromCreateEvent(event *gomatrixserverlib.Event) (
//
// Returns the redaction event and the redacted event if this call resulted in a redaction.
func (d *EventDatabase) MaybeRedactEvent(
ctx context.Context, roomInfo *types.RoomInfo, eventNID types.EventNID, event *gomatrixserverlib.Event, redactAllowed bool,
ctx context.Context, roomInfo *types.RoomInfo, eventNID types.EventNID, event *gomatrixserverlib.Event, plResolver state.PowerLevelResolver,
) (*gomatrixserverlib.Event, *gomatrixserverlib.Event, error) {
var (
redactionEvent, redactedEvent *types.Event
@ -966,11 +977,20 @@ func (d *EventDatabase) MaybeRedactEvent(
return nil
}
// 1. The power level of the redaction event’s sender is greater than or equal to the redact level. (redactAllowed)
// 2. The domain of the redaction event’s sender matches that of the original event’s sender.
_, sender1, _ := gomatrixserverlib.SplitID('@', redactedEvent.Sender())
_, sender2, _ := gomatrixserverlib.SplitID('@', redactionEvent.Sender())
if !redactAllowed || sender1 != sender2 {
var powerlevels *gomatrixserverlib.PowerLevelContent
powerlevels, err = plResolver.Resolve(ctx, redactionEvent.EventID())
if err != nil {
return err
}
switch {
case powerlevels.UserLevel(redactionEvent.Sender()) >= powerlevels.Redact:
// 1. The power level of the redaction event’s sender is greater than or equal to the redact level.
case sender1 == sender2:
// 2. The domain of the redaction event’s sender matches that of the original event’s sender.
default:
ignoreRedaction = true
return nil
}